李家和王家共养了521头牛,李家的牛群中有67%是母牛,而王家的牛群中仅有1/13是母牛,李家和王家各养了多少头牛?
李家和王家共养了521头牛,李家的牛群中有67%是母牛,而王家的牛群中仅有
是母牛,李家和王家各养了多少头牛?
1 |
13 |
数学人气:248 ℃时间:2020-03-25 02:25:05
优质解答
算术解法:①李家养牛数的67%是母牛,母牛数应当是整数,67是质数,所以,李家养牛数应当是100的倍数,可能是500、400、300、200或100头;②王家的牛群中有113是母牛,21、121、221、321和421中仅有221能为13整除,...
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